Suppose the spot price of the US $ is $7\mathrm{.}2/$US$ and that the exchange rate $/$US$ $($i$.$e per dollar price in

$)$ can move up by $10\%$ or down by $10\%$ per period. The riskfree rate in China is $(3+0\mathrm{.}4+0\mathrm{.}1)\%$ and is $(5+0\mathrm{.}4)\%$ in the US per period.

Calculate the values $($in yuan$)$ of the following European options.

$(3\mathrm{.}1)$ The option to buy one US dollar with $7\mathrm{.}3$ yuan in two periods.

$(3\mathrm{.}2)$ The option to buy $7\mathrm{.}3$ yuan with one US dollar in two periods.